﻿<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>LOGO像雪花一样落下</title>
    <script type="text/javascript" language="JavaScript">
        //窗口改变时重新加载页面  -Netscape的浏览器
        function MM_reloadPage(init) {
            if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
                document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
            else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
        }
        MM_reloadPage(true);
        //窗口改变时重新加载页面  -IE浏览器
        function MM_preloadImages() {
            var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
                var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
                    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
            sjLayer.style.visibility='hidden';
            eslayer.style.visibility='hidden';
        }

        function MM_swapImgRestore() {
            var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
        }

        function MM_findObj(n, d) {
            var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
                d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
            if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
            for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
        }

        function MM_showHideLayers() {
            var i,p,v,obj,args=MM_showHideLayers.arguments;
            for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
                if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
                obj.visibility=v; }
        }
        
    </script>
</head>
<body>
<script type="text/javascript" language="JavaScript">
    //判断浏览器
    var ns4up = (document.layers) ? 1 : 0;
    var ie4up = (document.all) ? 1 : 0;
    var no = 3;                             // 显示的图像数量
    var speed = 20;                         // 图像移动的速度
    var snowflake ="LOGO1.gif";      //图像地址
    var filen = "http://www.baidu.com"         	            // 单击图像时的链接
    var dx, xp, yp;
    var am, stx, sty;
    var i, doc_width = 400, doc_height = 600;
    if (ns4up) {
        doc_width = self.innerWidth;
        doc_height = self.innerHeight;
    } else if (ie4up) {
        doc_width = document.body.clientWidth;
        doc_height = document.body.clientHeight;
    }
    dx = new Array();
    xp = new Array();
    yp = new Array();
    am = new Array();
    stx = new Array();
    sty = new Array();
    for (i = 0; i < no; ++ i)
    {
        dx[i] = 0;                             // set coordinate variables
        xp[i] = Math.random()*(doc_width-50);  // set position variables
        yp[i] = Math.random()*doc_height;
        am[i] = Math.random()*20;              // set amplitude variables
        stx[i] = 0.02 + Math.random()/10;      // set step variables
        sty[i] = 0.7 + Math.random();          // set step variables
        if (ns4up) {                           // set layers
            if (i == 0) {
                document.write("<html><title></title><body>");
                document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
                document.write("top=\"15\" visibility=\"show\"><A href=\"" + filen + "\" target=\"_blank\"><img src=\"");
                document.write(snowflake + "\" border=\"0\"></layer>");
                document.write("</body></html>");
            } else {
                document.write("<html><title></title><body>");
                document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
                document.write("top=\"15\" visibility=\"show\"><A href=\"" + filen + "\" target=\"_blank\"><img src=\"");
                document.write(snowflake + "\" border=\"0\"></layer>");
                document.write("</body></html>");
            }
        } else if (ie4up) {
            if (i == 0) {
                document.write("<html><title></title><body>");
                document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
                document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
                document.write("visible; TOP: 15px; LEFT: 15px;\"><a href=\""+filen+"\" target=\"_blank\"><img src=\"");
                document.write(snowflake + "\" border=\"0\"></div>");
                document.write("</body></html>");
            } else {
                document.write("<html><title></title><body>");
                document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
                document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
                document.write("visible; TOP: 15px; LEFT: 15px;\"><a href=\""+filen+"\" target=\"_blank\"><img src=\"");
                document.write(snowflake + "\" border=\"0\"></div>");
                document.write("</body></html>");
            }
        }
    }
    //实现Netscape浏览器中动画效果的方法
    function snowNS() {
        for (i = 0; i < no; ++ i)
        {
            yp[i] += sty[i];
            if (yp[i] > doc_height-50) {
                xp[i] = Math.random()*(doc_width-am[i]-30);
                yp[i] = 0;
                stx[i] = 0.02 + Math.random()/10;
                sty[i] = 0.7 + Math.random();
                doc_width = self.innerWidth;
                doc_height = self.innerHeight;
            }
            dx[i] += stx[i];
            //指定图像的显示位置：x和y坐标
            document.layers["dot"+i].top = yp[i];
            document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
        }
        setTimeout("snowNS()", speed);
    }
    //实现IE浏览器中动画效果的方法
    function snowIE()
    {
        //判断图像的数量
        for (i = 0; i < no; ++ i) {
            yp[i] += sty[i];
            if (yp[i] > doc_height-50) {
                xp[i] = Math.random()*(doc_width-am[i]-30);
                yp[i] = 0;
                stx[i] = 0.02 + Math.random()/10;
                sty[i] = 0.7 + Math.random();
                //重新获取文档的高度和宽度
                doc_width = document.body.clientWidth;
                doc_height = document.body.clientHeight;
            }
            dx[i] += stx[i];
            //指定图像的显示位置：x和y坐标
            document.all["dot"+i].style.pixelTop = yp[i];
            document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
        }
        setTimeout("snowIE()", speed);  //根据速度循环执行动画方法
    }
    //判断浏览器类型，并调用不同的动画方法
    if (ns4up) {
        snowNS();
    } else if (ie4up) {
        snowIE();
    }
    
</script>

</body>
</html>